PostGIS  2.3.7dev-r@@SVN_REVISION@@
const POINT3DZ* getPoint3dz_cp ( const POINTARRAY pa,
int  n 
)

Returns a POINT3DZ pointer into the POINTARRAY serialized_ptlist, suitable for reading from.

This is very high performance and declared const because you aren't allowed to muck with the values, only read them.

Definition at line 499 of file lwgeom_api.c.

References POINTARRAY::flags, FLAGS_GET_Z, getPoint_internal(), lwerror(), and POINTARRAY::npoints.

Referenced by pointArray_to_geojson(), pointArray_toGML2(), pointArray_toGML3(), and ptarray_to_GEOSCoordSeq().

500 {
501  if ( ! pa ) return 0;
502 
503  if ( ! FLAGS_GET_Z(pa->flags) )
504  {
505  lwerror("getPoint3dz_cp: no Z coordinates in point array");
506  return 0; /*error */
507  }
508 
509  if ( (n<0) || (n>=pa->npoints))
510  {
511  lwerror("getPoint3dz_cp: point offset out of range");
512  return 0; /*error */
513  }
514 
515  return (const POINT3DZ*)getPoint_internal(pa, n);
516 }
int npoints
Definition: liblwgeom.h:370
uint8_t flags
Definition: liblwgeom.h:368
uint8_t * getPoint_internal(const POINTARRAY *pa, int n)
Definition: ptarray.c:1706
#define FLAGS_GET_Z(flags)
Macros for manipulating the 'flags' byte.
Definition: liblwgeom.h:139
void lwerror(const char *fmt,...)
Write a notice out to the error handler.
Definition: lwutil.c:102

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